whats that tool gs provides to reduces picture sizes??

theres a tool some ppl talk about that reduces the sizes of the pngs or something. it used to be listed in the gs tools section but i can't remember the name. "optim" something lol
Comments
Send and Receive Data using your own Server Tutorial! | Vote for A Long Way Home on Steam Greenlight! | Ten Years Left
Send and Receive Data using your own Server Tutorial! | Vote for A Long Way Home on Steam Greenlight! | Ten Years Left
ImageOptim
I'm trying to reduce the images in the ram. The viewer tells me my game is 60+ of ram with images being the highest